linux-kernel - Re: [dm-devel] [PATCH][RFC] dm: Do not open log and cow device read-write for read-only mappings

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Message-ID: <20110216083951.GC19830@htj.dyndns.org>
Date:	Wed, 16 Feb 2011 09:39:51 +0100
From:	Tejun Heo <tj@...nel.org>
To:	Milan Broz <mbroz@...hat.com>
Cc:	Alasdair G Kergon <agk@...hat.com>, Neil Brown <neilb@...e.de>,
	device-mapper development <dm-devel@...hat.com>,
	Jens Axboe <axboe@...nel.dk>, Tao Ma <tm@....ma>,
	linux-kernel@...r.kernel.org
Subject: Re: [dm-devel] [PATCH][RFC] dm: Do not open log and cow device
 read-write for read-only mappings

On Tue, Feb 15, 2011 at 05:58:45PM +0100, Milan Broz wrote:
> # blockdev --setrw /dev/sd[bcde]
> # mdadm -A /dev/md0 /dev/sd[bcde]
> mdadm: /dev/md0 has been started with 4 drives.
> # mdadm --stop /dev/md0
> mdadm: stopped /dev/md0
> # blockdev --setro /dev/sd[bcde]
> # mdadm -A /dev/md0 /dev/sd[bcde]
> mdadm: cannot re-read metadata from /dev/sdb - aborting
> 
> Works on 2.6.36.

Isn't failing to assemble rw array from ro devices the expected
behavior?  I think I'd want that to fail.  Neil, what do you think?

-- 
tejun
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